260 cs 9-4-7 lucian 2 infernals gets downed by a 140 cs 3-6 vayne in 2 seconds.

If you can survive longer, you can deal more DPS. In that sense, Randuins helps you kill Vayne a lot better than any offensive item you could pick up. Don't build glass cannon and then complain that another glass cannon can kill you.

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Great idea. Let me just pick up randuins as my 3rd item playing as Lucian.

I actually used to make it on vayne. It's so op. Why kite when you can just tank and kill faster.